I enclose a simplified more accurate version of the macro, rapps3.d3m, which

no longer offers the option of the average of the points as the expansion centre -

mainly because I found, for a circle for instance, that there are points at both start and end of the circle, and you get a warped-average effect as a result. (probably partly why prl went to the lengths he did at the time, to eliminate duplicates).

Hence, with this latest macro, you have to set a new origin (eg and a temp working plane will achieve that if you don't want to change the old origin).

And I recommend using three magnification factors (rather than 1), "mfx, mfy, and mfz" - and with the example enclosed, I used -1.5, -1.5, and 1.0 - reason being that it gives you more flexibility on where you set origin - eg if you look at the jpeg, the origin is the centre of the circle in the foreground (2 cents)

More accurate/reliable.

cheers

sam

PS minstrel

it also asks if you want to redraw each step (and gives you the option of yes or no ) - all to do with prl's suggested changes in reply #6 (and, if you opt for no = the default, then it is significantly quicker, eg for the superman example) - 2 cents